Did you find a solution for this? I found another post with the same 403 Forbidden issue: https://community.appdynamics.com/t5/General-Discussions/HTTP-403-when-pushing-OpenTelemetry-Metrics-into-AppDynamics/m-p/49298 The solution suggested in that thread is to only send traces, and not metrics -- which is what I am doing (only sending traces), and from the configuration in the original post it is only configured to send traces as well. ... View more

Any luck with this?  I am also getting 403 Forbidden, and am only sending Traces (no logs or metrics configured, only traces). Forbidden seems like an authentication issue (in fact I get the same response if I change/remove the x-api-key). The issue is also mentioned by another post: https://community.appdynamics.com/t5/General-Discussions/Cannot-push-traces-through-OpenTelemetry-into-AppDynamics/td-p/49072 ... View more

The FAQ article does not mention 403 errors at all, so is no help. I am getting the same issue, I am getting a 403 (Forbidden) response when trying to sent OpenTelemetry. In my case the endpoint from the setup screen was https://pdx-sls-agent-api.saas.appdynamics.com/ , however I an in Australia, so I also tried  https://syd-sls-agent-api.saas.appdynamics.com/ and got the same response. As it seems like a permission/auth thing, I also tried with the x-api-key having a wrong value and blank, and both got the same response ... View more